Based on the critically acclaimed novel by Chinese writer Xixi, 2 BECOME 1 is a woman's odyssey of her fight with breast cancer. The story centers on a regular white-collar woman named BINGO (Miriam Yeung), who leads a carefree city life that includes guarding her turf in the office and dating and gossiping with her three girlfriends. However, her carefree life soon turns upside down when she found a lump in her breast. Everything begins to fall apart as she tries to cope with the loss of femininity in a series of bittersweet events. With the help of a happy-go-lucky doctor V (Richie Jen) and a shy but talented teenager SING (Justin Lo), Bingo begins to find new meanings in her turmoil and the will to face her own demons.